Thread subject: Diptera.info :: Strange Geomyza tripunctata? --> G. tripunctata or G. nartshukae
Posted by fatsemann on 18-07-2020 21:36
#1
Hello,
this fly reminds me of Geomyza tripunctata.
I only know G. tripunctata with a gray-black thorax, but this is red-brown. Is it G. tripunctata or another species?
Date: Jul 17, 2020
Location: Germany, NRW, 47608 Geldern
Size: body 4 mm, with wings 4.8 mm
Best regards
Bernd
Edited by fatsemann on 27-09-2020 06:38
Posted by fatsemann on 18-07-2020 21:36
#2
2
Posted by Sundew on 18-07-2020 23:07
#3
This is probably
Geomyza hackmani (see
https://diptera.i...d_id=14622 for more information). It seems to be a male, so the shape of the genitalia would allow for an unambiguous differentiation from
G. balachowskyi.
Regards, Sundew
Edited by Sundew on 18-07-2020 23:25
Posted by Nacho Cabellos on 19-07-2020 11:41
#4
Hello. I'm not an expert but I think it`s
G. tripunctata. The spot near to R1 is a characteristic this species shares with
G.nartshukae, but i thik that it lacks in
hackmani or
balachowski. As to thorax colour, it's very variable, i think.
Posted by Sundew on 19-07-2020 13:20
#5
So we urgently need the opinion of our expert Jan Willem! I am aware that there are some strangely strong spots, but I cannot remember a case when a specimen with a brown thorax was identified as
G. tripunctata... On the other hand, Malcolm Storey gives a picture of just such an animal:
https://www.disco...mp;res=640. That is exciting - now I really would like to know, too!
Posted by fatsemann on 19-07-2020 22:20
#6
3
Posted by Jan Willem on 20-07-2020 19:38
#7
This is a male of either
G. tripunctata or
G. nartshukae. The reddish thorax would point to the latter, but unfortunately the coloration of the thorax is very variable in the
G. tripunctata. It seems like especially in Southern Europe, the thorax tends to be more reddish brown, but I see more and more specimens from the Netherlands which also have a rather reddish brown thorax. To be sure the genitalia should be studied.